These Japanese-style tubs made of Australian Jarrah wood are extra deep so you can sit up straight while still feeling cocooned in its watery warmth. Inman Oasis offers private sessions — well, with a two person minimum, so bring a pal — starting at $40 for a 30-minute soak, or a discounted community teak tub for those less bashful. The staff will keep you hydrated on the house and towels and robes are provided on-site.243 Hampshire St, Cambridge, 617-491-0176

You can book hydrotherapy at Body Mechanics in 30-minute increments, starting at $40, with space to share for up to four friends. The tubs are more in-line with the jacuzzi variety you’d find in your suburban backyard, but still nothing to scoff at. The ideal scenario at this Allston joint is to book a dual deep tissue massage though, as your jet-loosened muscles are soft and pliable for an effective stretch.387 Cambridge St, Allston, 617-782-3311

If you book a service at G20 — be that a hair cut, a massage or evenjust a manicure — you can take advantage of their day spa amenities, provided you time it right. Arrive early for a luxurious soak in their penthouse hot tub on the house. The skylight views are easy to take in, but a three-tier waterfall in the “brine room” and a fireside lounge are also calling.278 Newbury St, Boston, 617-262-2220